نيما ازاد

In this study, the Equal Channel Angular Pressing (ECAP) process was investigated as a modern and effective method for enhancing the mechanical properties of composite materials. Initially, ECAP dies with a cubic design were fabricated using H13 tool steel, selected for its high resistance to heat and pressure, which performed effectively under ECAP conditions. To ensure integrity and performance of die, stress analysis was carried out under applied load. Following extensive eva‎luations, the cubic design was chosen for its ability to accommodate multiple channels with various angles and dimensions. Heat treatment and surface hardening further improved the die’s hardness and durability. From an economic perspective, all design decisions were made with the aim of minimizing costs and optimizing resources. After die fabrication, Mg-HA composite samples were processed using ECAP, and a series of mechanical tests—including tensile, compressive, and microhardness tests were conducted. The results showed significant improvements in yield strength, ultimate tensile strength, and hardness. These enhancements became more pronounced with an increasing number of ECAP passes, primarily due to grain refinement and improved microstructural uniformity. Final microstructural analyses confirmed that ECAP induces severe plastic deformation, which leads to grain size reduction and enhancement of mechanical behavior. These findings highlight the effectiveness of the ECAP technique in improving the performance of composite materials, making it a promising approach for advanced applications in the automotive, aerospace, and biomedical industries. The correlation between mechanical and microstructural results clearly confirms the positive impact of the process.

تغيير شكل پلاستيك شديد , پرسكاري در كانال‌هاي هم‌زاويه , طراحي قالب، منيزيم , هيدروكسي‌آپاتيت

Severe Plastic Deformation , Equal Channel Angular Pressing , Die Design , Magnesium , Hydroxyapatite

Nima Azad

Mohammad Sedighi